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论文类型：期刊论文

发表时间：2008-08-01

发表刊物：CHINA FOUNDRY

收录刊物：SCIE、Scopus

卷号：5

期号：3

页面范围：194-198

ISSN号：1672-6421

关键字：functionally graded materials (FGM); aluminum alloys; ultrasonic cavitation; acoustic streaming; degassing

摘要：Functionally graded materials (FGM) have been widely used in many industries such as aerospace, energy and electronics. In this experimental study of fabricating FGM, an approach was developed to prepare Al/Si FGM using power ultrasonic separation method. Material sample with continuously changing composition and performance/properties was successfully produced. Results showed that the microstructure of the FGM sample transited, from its top to bottom, from the hypereutectic structure with a large quantity of primary Si gradually to the eutectic, and finally to the hypoeutectic with numerous primary Al dendrites. The distribution of primary Si and microhardness of the FGM sample also presented graded characteristics, resulting that the wear resistance of the FGM sample decreased from top to bottom. Preliminary discussion was made on the mechanism of the formation of Al/Si FGM.